Level.



like, though it is OF WATERBURY, CONNECTICUT.

HAYDEN WlLLlAM BROWN,

LEVEL.

Specification of Letters Patent. Patented June 30, 1908. Serial No.409,510.

Application filed January 6, 1908.

T 0 all whom it may concern:

Be it known that 1, HAYDEN W. BROWN, a citizen of the United States, anda resident of Waterbury, in the county of New Haven and State ofConnecticut, have invented a new and Improved Level, of which thefollowing is a full, clear, and exact description. I This inventionrelates to levels, and more I barrel, a post or the like, and as it isadjustable, sights can be taken with it in all directions radiating fromthe point at which the level is arranged.

Among the advantages of my invention are its adaptability toarchitectural and engineering purposes, the simplicity of its construction, the eflioiency of its operation and particularly toinstruments of this kind used the cheapness of its manufacture. bymasons, builders and others, in archl- Referrmg'more particularly to thedraw- 1, which may be cast or ings I provide a base otherwise formedfrom suitable material such as iron, brass or the like. The base 1 ispreferably rectangular in form, and near the corners has threaded openins in which are ar ranged the corresponding y threaded shanks 3 ofsupports 2. The su ports 2 have intoral collars or nuts 4 which areburred, and

y means of which the supports can be easily adjusted. Thelower end ofeach support is pieferably tapered to a point, to insure the m mountingof the instrument. At the upper face, the base 1 has formed thereon anintegral track or guideway 5 which is preferably annular inform.

A supporting member or yoke 6 of elongated form, and rovided at the endswith parallel, upward y extending arms 7, is mounted upon the track 5and has similar guide grooves 8 to receive the track. By means of apivot bolt 9, having a head 10 and a nut 11, the yoke is pivotallysecured in po sition upon the base 1, and in this way is arranged toswing freely upon the track 5. The base has a threaded opening toreceive the bolt and thus the nut 11 acts as a locknut as well as aretaining-nut.

At the upper ends, the arms 7 have sockets 12 in which is arranged asight tube 13. Like the yoke, the sight tube is formed from any suitablematerial such as cast-iron, brass or the like. At one end, the sighttube has an e e-piece 14 provided with a constricted portion adapted tofit into the end of the tube, and having the outer face concave. A sightopening 15 is formed at the center of the eyepiece and permits theoperator to look through the eye piece, throu h the sight tube. At theopposite end of the sight tube is arranged a sight glass 16 mounted inRosition by means of rings or washers 17 anc 18, which are cemented orotherwise secured in position. The sight glass has cross lines 19engraved or otherwise indicated thereon. It

will be understood that the sight opening 15 and the intersection of thesight lines are tectural and engineering work.

An object of the invention is to rovide a simple, inexpensive andeflicient evel, by means of which the elevation and alinement of objectsat difierent points and in different directions can be ascertained.

A further object of the'invention is to provide a device of the classdescribed, comprisin an adjustable base, a sighting tube, and a evelpivotally mounted upon said base, and having means for guiding therelative movements of the parts.

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth in theclaims.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views, and in which Figure 1 is alongitudinal section of the level; Fig. 2 is an end elevation of thesame; Fig. 3 is a plan view showing certain of the parts in differentpositions in dotted outlines; and Fig. 4 is a transverse section on theline 1-4 of Fig. 1.

Before proceeding to a more detailed eX- lanation of my invention, itshould be unerstood that the level is particularly useful in connectionwith masonry work and the also adapted to other purposes for whichlevels are ordinarily employed. In masonry work, if the mason desires tofind a level or to ascertain the alinement of certain objects or points,it is necessary to employ a surveyors level, or to take sights along anordinary wooden level. The latter method is, of course, inaccurate and acrude one. Furthermore, t e expensive surveyor s level is seldomavailable to the mason. Also, sightin along a wooden level isimpracticable it is necessary to sight to a lurality of points not inthe same line.

My invention can be set up upon any suitable support, such, for exampleas a stone, a

alined centrally with respect to the sight tube, in the usual manner.The sight tube can be firmly secured in position in the sockets 12 bymeans of a set screw 25 carried by one of the sockets.

By means of screws 21, a level holder 20 is mounted upon the up er sideof the sight tube. Within the level holder is a level tube 22 containinga liquid and a, level bubble, in the usual manner. At the center, theholder 20 has a sight opening 23 provided with an indicator 24, by meansof which the osition of the bubble can be ascertaine This spirit levelmay be replaced, if so desired, by any other suitable levelin means.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent 1. In a device of the class described, a base havingmeans for adjusting it and an annular upwardly extended portion forminga track, a member pivoted upon said base and arranged to move upon saidtrack, said member having upwardly disposed sides, and sighting andleveling means carried by said member.

2. In a device of the class described, a base having adjustable supportsand a guideway, a yoke pivotally mounted upon said base and having agroove engaging said guideway, and

- said tube.

4. In a device of the class described, a base havin threaded openings,supports having threa ed portions mounted in said openings andpresenting means for their adjustment, said base having an annular trackupon its upper face, a yoke, means for pivotally mounting said yoke uponsaid base, said yoke having grooves slidably engaging said track andarms presenting sockets, a sight tube ar ranged in said sockets andhaving an eyepiece and cross-sights, and a levelarranged upon said sighttube.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HAYDEN WILLIAM BROWN.

Witnesses:

PATRICK J. McMAHoN, JOHN F. MOGRATH.

